Originally Posted by Blizzard Entertainment
After the release of Goblins vs Gnomes, we kept an eye on the state of game balance as more matches were played with the new cards we introduced to Hearthstone. After careful consideration we have decided to make a balance change to the card Undertaker.
The following balance change will be made in an upcoming patch:
Undertaker now reads: Whenever you summon a minion with Deathrattle, gain +1 Attack.
Undertaker was frustrating to play against. It often gained both Attack and Health stats significantly above those of other inexpensive minions very early in the game. With this change, we expect Undertaker will still be better than other 1-Mana minions when played in a deck with a Deathrattle theme, but more likely to die in combat against other minions.